Priming-heater for automobiles.



R. C. GROH & M.A. HANSEN.- PRIMlN-G HEATER FOR AUTOMOBILI'S.v APPLICATION man JAN. 4, 1915.

.Patented May 7,1918.

UNITED STATES PATENT OFFICE..

ROBERT C. GROH AND MARTIN A. HANSEN, OF ST. PAUL, MINNESOTA. ASSIGNOES OF ONE-FOURTH TO OLIVER J. DUFRENE AND ONE-FOURTH TO HANS A. SVENDSEN,

BOTH OF ST. PAUL, MINNESOTA.

PRINTING-HEATER FOR AUTOMOBILES.

vApplication led January 4, 1915. Serial No. 347.

of Ramsey and vState of Minnesota, haveinvented certain new and useful Improvementsl in Priming-Heaters for Automobiles, of which the following is aspecitication.

. Our invention relates to priming heaters for automobilesl and has for its object to provide an electric heater device of convenient size adapted to be connected within the intake pipe of an automobile or upon the primer tube of an automobileso 'that when electricity is supplied thereto the air entering the carbureter, or the priming fluid entering the carbureter, or both, may b e preheated to facilitate starting of the automobile.

secured in the intake pipe.

4 The full objects and advantages of our invention will appear in connection with the detailed description thereof and are particularly pointed out in the claims.

In the drawings, illustrating the application of our invention in one form,-

Figure 1 is a part sectional view of a carbureter and intake pipe showing our heater Fig. 2 is anenlarged sectional View of the heater along the longitudinal axis thereof. Fig. 3 is a transverse section through the center of the heater. Fig. 4: is a part sectional View of a portion of the device shown in Fig. 2 rotated through ninety degrees. Fig. 5 is a part diagrammatic view showing the device connected on a priming tube running from the fuel supply at the controller-board v of the automobile.'

Specification of Letters Patent.

Patented May 7, 1918.

shell 14, as shown, being in connection through a metallic header 15 with the outer shell 10. The other end of the heating element is closed by an insulating header 16 through which extends a connector rod or plate 17..

- lVhen the heater device is applied to the primer tube, as the tube 18, shown in Fig. 2, extending to the discharge pipe 19 of the carbureter 20, the said primer tube 18 is simply extended through the internal aperture of the inner shell 11, where such tube 18 contacts with the wall of such inner shell. By this means the wire 1l, through metal header 15, is placed in electrical communication with the primer tube 18, the other end of said wirev connecting through inem-y ber 17 With a wire Q1 which goes to a circuitcloser 22 connected with operating battery 23, the other. part of the circuit being made through the frame of the automobile in a well-known Way.

When it is desired to secure. the heater in the intake pipe Q4, ruiming to the carbureter 20, said heater is secured to the iiiner Wall of the intake pipe by means of an arm Q5 which is fastened by screw bolts or rivets 26 to the shell 10 of the heater,` and by similar screw bolts 27 to the wall of the intake pipe.

We claim:

1. An electric priming heater for explosive engines comprising an outer shell, an inner shell, a coil of resistance wire wound about said inner shell and insulated therefrom, a metal' head connecting one end of each shell. an insulating head connecting and supporting the other ends of said shells, one end of said coil being attached to and forming a contact with said metallic head and the other end passing through said insulating head and insulated from said other end.

2. An electric heater for explosive engines comprising an inner shell, an insulating sleeve shorter than said shell and passing over the same. an insulating head mo'unted upon one end of said inner shell adgacent said sleeve, a metallic head mounted upon the other end of said sleeve, the ends of said inner shell being rolled over said heads to force the same against the sleeve and hold them in place, an outer shell passing over said heads and similarly secured thereto to form an airtight chamber, and-a resistance coil Wound upon said insulating sleevebetween said inner and outer shells.

In testimonyl whereof we'axour signatures in presence of two Witnesses.

ROBERT C. GROH. MARTIN A. HANSEN.

Witnesses: l

F. A. WHITELEY, H. A. BOWMAN. 

